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  • 1990-1994  (3)
  • 1
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    Computational problems and signal processing in SETI (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The Search for Extraterrestrial Intelligence (SETI), currently being planned at NASA, will require that an enormous amount of data (on the order of 10 exp 11 distinct signal paths for a typical observation) be analyzed in real time by special-purpose hardware. Even though the SETI system design is not based on maximum entropy and Bayesian methods (partly due to the real-time processing constraint), it is expected that enough data will be saved to be able to apply these and other methods off line where computational complexity is not an overriding issue. Interesting computational problems that relate directly to the system design for processing such an enormous amount of data have emerged. Some of these problems are discussed, along with the current status on their solution.
    Keywords: SPACE SCIENCES (GENERAL)
    Type: ; : Astrophysical mase
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Tables of square-law signal detection statistics for Hann spectra with 50 percent overlap (1991)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The Search for Extraterrestrial Intelligence, currently being planned by NASA, will require that an enormous amount of data be analyzed in real time by special purpose hardware. It is expected that overlapped Hann data windows will play an important role in this analysis. In order to understand the statistical implication of this approach, it has been necessary to compute detection statistics for overlapped Hann spectra. Tables of signal detection statistics are given for false alarm rates from 10(exp -14) to 10(exp -1) and signal detection probabilities from 0.50 to 0.99; the number of computed spectra ranges from 4 to 2000.
    Keywords: STATISTICS AND PROBABILITY
    Type: NASA-TM-103830 , A-91037 , NAS 1.15:103830
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Efficient computational methods to study new and innovative signal detection techniques in SETI (1991)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The purpose of the research reported here is to provide a rapid computational method for computing various statistical parameters associated with overlapped Hann spectra. These results are important for the Targeted Search part of the Search for ExtraTerrestrial Intelligence (SETI) Microwave Observing Project.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-CR-193602 , NAS 1.26:193602
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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